Motor attachment for use by dentists or barbers



E. A. NEEL.

MOTOR ATTACHMENT FOR USE BY DENTISTS 0R BARBERS.

APPLICATION FILED OCT. 31,1919.

Patented Nov. 30, 1920.

2 SHEETSSHEET 1- Tim-T T T E. A. NEEL.

MOTOR ATTACHMENT FOR USE BY DENTISTS OR BARBERS.

APPLICATION FILED OCT. 31,1919.

Patented Nov. 30, 1920.

2 SHEETS-SHEET 2.

- person being operated upon.

UNITED sTAr PATENT OFFICE.

ERNEST ARMOND NEEL, 0F RIPLEY TENNESSEE, ASSIGNOR OF ONE-HALF TO GORDON GRIFFIN, 0F MEMPHIS, TENNESSEE.

MOTOR ATTACHMENT FOR USE BY DENTISTS OR BARBERS.

Specification of Letters Patent.

Patented Nov. 30, 1920.

Application filed October 31, 1919. Serial No. 334,665.

the invention, such as will enable others skllled in the art to which it appertains to make and use the same.

My invention relates" to attachments for use with electric motors in such places as it may be desirable to drive simultaneously or singly two cutting or boring implements from a single electric motor.

The invention is especially adapted for use in dentists ofiices where it is desirable to provide a quick and convenient attachment for driving the rotary instrument for treating the teeth; or in barber shops where it is desirable to provide clipping instruments for use in trimming the hair or treating the face.

Under such conditions it has hitherto been the custom to use a single electric motor for driving each implement, and where there are two barbers who desire to use the clippers it is customary for one to wait on the other, thus necessitating delay to the In the same way, where there are two dentist chairs with a single motor it has hitherto been the custom to treat each patient separately.

According to my invention I provide the armature shaft tothe motor with two free ends, each projecting beyond the motor casing, and I provide the arrangements by means of which an implement may be driven from each end of the motor shaft, and also I provide means for cuttingout either or both implementswhen not in use, and also for starting or stopping the rotation of the armature shaft referred to.

One embodiment of my invention as applied to use in barber shops is shown in the accompanying drawings, in which like parts are indicated by similar reference symbols throughout the several views, and in which:

Figure 1 shows the motor mounted between two barber chairs, the motor being shown on a greatly enlarged scale relative to the chairs.

Fig. 2 is a front elevation of the motor on a still larger scale than in F ig. 1, parts being broken away. i

Fig. 3 shows a central horizontal section through the clutch for attaching one end of the armature shaft of the motor to the flexible driving shaft, the clutch being shown in the inoperative position.

F ig. 4 is a similar view to Fig. 3, but

shows the clutch in the engaging position.

Fig. 5 shows a section along the line 5--5 of Fig. 3, and looking in the direction of the arrows.

Fig. 6 shows'a section along the line 6-6 of Fig. 3, and looking in the direction of the arrows and Fig. 7 is a plan View of the swiveled head on which the motor is pivoted, and to which the various tools are suspended.

A and Af, shown in Fig. 1, represent two barber chairs shown on a much reduced scale with regard to the motor, and between these chairs I provide a tubular support B on which the swiveled head 0 is mounted. This head is provided with a socket c to engage the lug d of the motor casing D, and this head may be provided with a series of arms, preferably hook-shaped as shown at C, on which may be conveniently hung the various tools or other implements which are intended to be driven by the motor.

The electric motor is provided with leading-in wires 6, controlled by the switch E, and receiving current from any suitable source of electricity E, as shown most clearly in Fig. 1. p

The armature shaft F of the motor is journaled in suitable bearings, such as D',

referably integral with the motor caslng l), as shown most clearly in Figs. 3 and 4, and each end of the shaft carries a clutch member G provided with engaging teeth 9 and connected to the armature shaft in any convenient way, as by means of the pin g.

' see Figs. 3 and 4.

The companion member of the clutch H is provided with engaging teeth h and with an annular groove h adapted to engage the pins is on the sliding sleeve K, which is normally pressed forward by'the spring L mounted in the casing M, which spring abuts against a shoulder m of the clutch casing M. The forward end of this casing is screwed, as at m, onto the bearing D, and the clutch member H is connected to the flexible shaft I which is carried in the flexible casing P, connected by the union P to the clutch casing M. The free end of this flexible shaft I is connected to the implement to be operated, indicated by the clippers Q, see Fig. l.

The clutch member H is thrown into and out of engagement by means of the handle R which is fast to the sliding sleeve K, and has its stem 1 projecting into the L-shaped slot min the clutch casing M. By drawing the handle R to" the rear and turning it slightly to the ppsition shown in Fig. 2, the clutch member is held out of engagement, as shown in Fig. 3, while by reversing the movement of the handle R the clutch member H is thrown into engagement as shown in Fig. 4.

The construction of the clutch at the opposite side of the motor is substantially identical with that shown in Figs. 3 and 4, except that the direction of the teeth would, of course, be reversed, since the electric motor is designed to rotate in one direction only.

It will be obvious that either or both implements may be thrown out of operation, or either or both thrown into operation while the motor is running, and that the motor may be cut off when desired. Thus,.by using a single electric motor and motor support, two tools or other implements may be independently operated, and thus two barbers or two dentists may be able to independently use the apparatus driven by the motor without interfering with each other.

It will be obvious that various modifications might be made in the herein described apparatus and in the construction, combination and arrangement of parts which could be used without departing from the spirit of my invention, and I do not mean to limit the invention to such details except as particularly pointed out in the claims.

Having thus described my invention what I claim and desire'to secure by Letters Patent of the United States is:

1. The combination with an electric motor provided with a casing having oppositely disposed journal bearings therein, and with an armature shaft having its free ends proj ecting through and beyond said bearings, of clutch members connected respectively to the free ends of said armature shaft, clutch casings connected respectively to said oppositely disposed bearings, and containing sliding clutch members adapted to cooperate with those carried by the corresponding ends of the armature shaft, said sliding clutch members being mounted in said clutch casings, meansfor throwing said sliding clutch members into and out of engagement as desired, flexible shafts connected to said sliding clutch members, and implements connected to and operated by said flexible shafts, substantially as described.

2. The combination with an electric motor provided with a casing having oppositely disposed journal bearings therein, and with an armature shaft having its free ends projecting through and beyond said bearings, of clutch members connected respectively to the free ends of said armature shaft, clutch casings connected respectively to said oppositely disposed bearings, and containing sliding clutch members adapted to cooperate with those carried by the corresponding ends of the armature shaft, said sliding clutch members being mounted in said clutch casings, means for throwing said sliding clutch members into and out of engagement as desired, flexible shafts connected to said sliding clutch members, and clippers connected and operated by the free end of each flexible shaft, substantially as described.

3. In apparatus of the character described, the combination with a tubular support, of a head carried by said support and provided with projectingarms, an electric motor provided with a casing pivotally connected to said head,'said casing having oppositely disposed journal bearings therein, and with an armature shaft having its free ends projecting through and beyond said bearings, of clutch members connected respectively to the free ends of said armature shaft, clutch casings connected respectively to said oppositely disposed bearings, and containing sliding clutch members adapted to cooperate with thosetcarried by the corresponding ends of the armature shaft, said sliding clutch members being mounted in said clutch casings, means for throwing said sliding clutch members into and out of engagement as desired, flexible shafts connected to said sliding clutch members, and implements connected to and operated by said flexible shafts, substantially as described.

the free ends of said armature shaft, clutch casings connected respectively to said oppositely disposed bearings, and containing sliding clutch members adapted" to cooperate with those carried by the corresponding ends of the armature shaft, said sliding clutch members being mounted in said clutch casings, means for throwing said sliding clutch members into and out of engagement as desired, flexible shafts connected to said slid- 10 ing clutch members, and clippers connected and operated by the free end of each flexible shaft, substantiall as described.

ERN ST ARMOND N EEL. 

